A hybrid resorption-compression heat transformer for energy storage and upgrade with a large temperature lift

Journal article (2020)

Authors

L Jiang University of Aberdeen
R.Q. Wang Durham University
X. Toa Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering
A. P. Roskilly Durham University
Research Group
Engineering Thermodynamics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Compression Solar energy Heat transformer Resorption
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Published Date

2020

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Engineering Thermodynamics

Abstract

Heat transformers reveal significant potential for primary energy savings in domestic and industrial processes, which can use different heat sources as driving force to provide the heat or cooling. In this paper, a hybrid resorption-compression heat transformer is presented, which aims to upgrade the heat source e.g. industrial waste heat or solar energy with a large temperature lift. Performance of hybrid heat transformer is also compared with that of multi-stage sorption type. Results indicate that with heat source temperatures ranging from 40 °C to 90 °C, energy and exergy efficiencies of hybrid heat transformer decrease from 0.429 to 0.403 and from 0.8 to 0.64, respectively. Energy efficiency of hybrid type is a bit lower than that of basic resorption transformer but almost double higher than that of multi-stage cycle. For different operating parameters, mass ratio and global conversion rate have larger influences on thermal performance than isentropic efficiency of compressor. Also hybrid resorption-compression heat transformer is prospective for domestic heat application through the integration with solar photovoltaic thermal collector. When heat output temperature ranges from 50 °C to 70 °C, it could ensure that the heat density is higher than 1000 kJ·kgam−1 with an energy storage function.